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US2655481A - Oxide removing bath - Google Patents

Oxide removing bath Download PDF

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Publication number
US2655481A
US2655481A US85466A US8546649A US2655481A US 2655481 A US2655481 A US 2655481A US 85466 A US85466 A US 85466A US 8546649 A US8546649 A US 8546649A US 2655481 A US2655481 A US 2655481A
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US
United States
Prior art keywords
bath
weight
oxide removing
parts
removing bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US85466A
Inventor
Irvine C Clingan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastern Stainless Steel Corp
Original Assignee
Eastern Stainless Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastern Stainless Steel Corp filed Critical Eastern Stainless Steel Corp
Priority to US85466A priority Critical patent/US2655481A/en
Application granted granted Critical
Publication of US2655481A publication Critical patent/US2655481A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
    • C23G1/32—Heavy metals

Definitions

  • the present invention relates to the cleaning of metals, notably stainless steels.
  • this invention provides A further object is to provide such a bath that possesses a combination of beneficial properties mum softening ability.
  • a still further object is to provide a molten bath conslsting of an anhydrous mixture of causamount of a stabilizing agent, e. g. borax, which agent acts to not only stabilize the bath but also to rejuvenate the bath.
  • a stabilizing agent e. g. borax
  • the My invention provides a method for stabilizing the nitrate radical of a molten-caustic-nitrate bath without impairing, in any manner, the oxidizing capacity of the nitrate radical under the conditions of use.
  • small inclusions of sodium borate in the present in the bath may by weight of the total be from about 0.1 to 4% as indicated above the weight of the bath, and
  • a molten bath for removing oxides from the surface of metals which comprises a fused sub- 5 amount of iron.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Detergent Compositions (AREA)

Description

Patented Oct. 13, 1953 2,655,481 OXIDE REMOVING BATH Irvine 0. Eastern Cling-an, Stainless Baltimore, Md., assignor to Steel Corporation, Baltimore, d
d., a corporation of Marylan No Drawing. Application April 4, 1949, Serial No. 85,466
1 Claim. (Cl. 252135) The present invention relates to the cleaning of metals, notably stainless steels.
More particularly, this invention provides A further object is to provide such a bath that possesses a combination of beneficial properties mum softening ability.
A still further object is to provide a molten bath conslsting of an anhydrous mixture of causamount of a stabilizing agent, e. g. borax, which agent acts to not only stabilize the bath but also to rejuvenate the bath.
Various other objects and advantages of this invention will become apparent from the following description.
The use of molten sodium and/ or potassium hydroxides from temperatures ranging from 600 F. to 1000 F. has been employed for a number of peratures ranging from 600 to 1000 F. has been found to be very beneficial in efiecting the partial removal of this type of scale.
is removed from the molten solution and rapidly quenched in water. The reaction between the hot alkali metal hydroxides and the water, pro
duces super-heated steam that further shatters The My invention provides a method for stabilizing the nitrate radical of a molten-caustic-nitrate bath without impairing, in any manner, the oxidizing capacity of the nitrate radical under the conditions of use. I have discovered that small inclusions of sodium borate in the present in the bath may by weight of the total be from about 0.1 to 4% as indicated above the weight of the bath, and
parts by weight sodium hydroxide 10 parts by weight sodium nitrate 4 parts by weight sodium borate (Na2B4O710H2O') tween 830 F. and 870 F., preferably 850 F. for approximately eight minutes. Next, the metal for five to seven minutes in another customary by Weight by weight hydrofluoric acid at F. to F Again the metal is removed and washed in cold running water.
smooth, uniform, of maximum cleanness, and very pleasing in surface appearance. It has also been found that the surface of this metal has been improved in its resistance to rusting or corrosion and to its reception of surface coatings of various sorts. Further, the provision of the small amount of sodium borate clearly improves the stability of the bath and aids in regenerating the nitrate content of the bath.
The words employed. in this specification are for the purpose of description and not of limitation. The scope of the invention is set forth in the claim.
I claim:
A molten bath for removing oxides from the surface of metals which comprises a fused sub- 5 amount of iron.
stantially a nhydrous mixture of 90 parts by weight of sodium hydroxide, 10 parts by weight of an alkali metal nitrate, and about .1 to 4 parts by weight of sodium borate and a spectroscopic IRVINE C. CLINGAN.
References Cited in the file of this patent UNITED STATES PATENTS V 10 Number Name Date Spence et al June 3, 194? Bellis Aug. 13, 1929 McKay Jan. 27, 1942 Webster et al Jan. 11, 1949
US85466A 1949-04-04 1949-04-04 Oxide removing bath Expired - Lifetime US2655481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US85466A US2655481A (en) 1949-04-04 1949-04-04 Oxide removing bath

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US2655481A true US2655481A (en) 1953-10-13

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760927A (en) * 1955-11-14 1956-08-28 Kolene Corp Composition and a process for electrolytic cleaning of metals
US2920023A (en) * 1955-04-04 1960-01-05 Chrysler Corp Electrolytic cleaning of metal and composition therefor
US3010854A (en) * 1954-12-31 1961-11-28 Armco Steel Corp Pickling solution and method
US3121026A (en) * 1960-07-15 1964-02-11 Titanium Metals Corp Descaling metals and alloys with aqueous potassium hydroxide at relatively low temperature
US3260619A (en) * 1965-02-04 1966-07-12 Kolene Corp Methods and compositions for cleaning metal
DE2450396A1 (en) * 1973-10-23 1975-04-24 Nippon Steel Corp METHOD OF MANUFACTURING A HOT ROLLED ROLL WITH EXCELLENT PICKABILITY

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1724552A (en) * 1925-09-10 1929-08-13 Arthur E Bellis Salt bath
US2271375A (en) * 1935-08-13 1942-01-27 Rust Proofing Company Process of coating metal surfaces
USRE22837E (en) * 1947-01-28 Filling device with receptacle
US2458661A (en) * 1944-01-29 1949-01-11 J H Shoemaker Process of cleaning metal surfaces and compositions therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE22837E (en) * 1947-01-28 Filling device with receptacle
US1724552A (en) * 1925-09-10 1929-08-13 Arthur E Bellis Salt bath
US2271375A (en) * 1935-08-13 1942-01-27 Rust Proofing Company Process of coating metal surfaces
US2458661A (en) * 1944-01-29 1949-01-11 J H Shoemaker Process of cleaning metal surfaces and compositions therefor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3010854A (en) * 1954-12-31 1961-11-28 Armco Steel Corp Pickling solution and method
US2920023A (en) * 1955-04-04 1960-01-05 Chrysler Corp Electrolytic cleaning of metal and composition therefor
US2760927A (en) * 1955-11-14 1956-08-28 Kolene Corp Composition and a process for electrolytic cleaning of metals
US3121026A (en) * 1960-07-15 1964-02-11 Titanium Metals Corp Descaling metals and alloys with aqueous potassium hydroxide at relatively low temperature
US3260619A (en) * 1965-02-04 1966-07-12 Kolene Corp Methods and compositions for cleaning metal
DE2450396A1 (en) * 1973-10-23 1975-04-24 Nippon Steel Corp METHOD OF MANUFACTURING A HOT ROLLED ROLL WITH EXCELLENT PICKABILITY

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